New break for archaeal enzyme

James C. Wang

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New break for archaeal enzyme

机译：古细菌酶的新突破

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DNA topoisomerases have been dubbed the 'magicians' among the enzymes that catalyse cellular transformations — in their presence, individual DNA strands and double helices can pass_ through each other as if there were no physical barriers in-between.Topoisomerases probably entered the stage of evolution when the increasing length of DNA, or the formation of duplex DNA rings, created topologi-cal problems that needed to be resolved for propagation of the genetic material: for example, unravelling ofthe complementary DNA strands during replication; disentanglement of duplex DNA molecules during chromosomal condensation and segregation; and prevention of excessive supercoil-ing of the DNA template during transcription. Several mechanistically distinct DNA topoisomerases are known, and on page 414 of this issue, Bergerat et al. describe a fascinating new subfamily, through their study of an unusual topoisomerase from the archaeon Sulfolobus shibatae.

机译：DNA拓扑异构酶被称为催化细胞转化的酶中的“魔术师”，在它们的存在下，单个DNA链和双螺旋可以相互穿过，好像它们之间没有物理障碍。拓扑异构酶可能已进入进化阶段。当DNA长度的增加或双链DNA环的形成造成拓扑问题，而遗传物质的繁殖需要解决该拓扑问题时，例如复制过程中互补DNA链的解开；在染色体浓缩和分离过程中双链DNA分子解缠；以及防止转录过程中DNA模板过度超螺旋。已知几种在机械上不同的DNA拓扑异构酶，在本期第414页上，Bergerat等人。通过研究古细菌Sulfolobus shibatae中一种不寻常的拓扑异构酶，描述了一个引人入胜的新亚科。

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《Nature》 |1997年第6623期|p.329331|共2页
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James C. Wang;
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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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正文语种 eng
中图分类自然科学总论;
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6. On the role of a conserved potentially helix-breaking residue in the tRNA-binding α-helix of archaeal CCA-adding enzymes [O] . Hyundae D. Cho, Vanita D. Sood, David Baker, 2008

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New break for archaeal enzyme

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